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v3.25.3

Goodwill and other intangible assets - Intangible assets (Detail) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Insurance and Other [Member] |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | $ 51,511 | $ 50,874
Accumulated amortization | 17,456 | 16,236
Net carrying value | 34,055 | 34,638
Railroad, Utilities and Energy [Member] |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 1,981 | 1,990
Accumulated amortization | 918 | 854
Net carrying value | 1,063 | 1,136
Customer relationships [Member] | Insurance and Other [Member] |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 31,150 | 30,941
Accumulated amortization | 9,428 | 8,840
Net carrying value | 21,722 | 22,101
Trademarks and trade names [Member] | Insurance and Other [Member] |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 9,047 | 9,007
Accumulated amortization | 1,146 | 1,041
Net carrying value | 7,901 | 7,966
Customer relationships and contracts [Member] | Railroad, Utilities and Energy [Member] |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 1,540 | 1,553
Accumulated amortization | 785 | 728
Net carrying value | 755 | 825
Other intangible assets [Member] | Insurance and Other [Member] |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 5,614 | 5,551
Accumulated amortization | 2,216 | 1,996
Net carrying value | 3,398 | 3,555
Other intangible assets [Member] | Railroad, Utilities and Energy [Member] |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 441 | 437
Accumulated amortization | 133 | 126
Net carrying value | 308 | 311
Patents and technology [Member] | Insurance and Other [Member] |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 5,700 | 5,375
Accumulated amortization | 4,666 | 4,359
Net carrying value | $ 1,034 | $ 1,016

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- Definition Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] + References No definition available. + Details
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- Definition Sum of the carrying amounts of intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References No definition available. + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name Accounting Standards Codification -Section 55 -Paragraph 40 -SubTopic 30 -Topic 350 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 10 -Name Accounting Standards Codification -Section S45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480265/350-10-S45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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- Definition Amount before accumulated amortization of intangible assets, excluding goodwill. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(15)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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